I am using Keyframe shapes and pixel mapper effects on Titan regularly, but it seems that I can't activate something.

I want to enable effect speed to change it on fader. Normally I change it in "Playback options": Effect Speed on Fader and Shape Size Fixed.

Everytime I do it, it seems like the speed is changing, but the size of the shape is changing together with it as well, which I don't want. Is that maybe a bug or something (I am using already pretty old version of the Titan, 9.1)?